I got my case from BBTS last night and was surprised at the "jelly" feel of the arms, I was expecting it to be some sort of foam or more of a hard rubber like most bendy toys. I can't say for certain but it feels like silicone to me. The feel reminds me of those heat proof kitchen mitts or the silicone cookware, if it is silicone maybe it won't be as prone to break-down like foam or harder rubber would be...